Debian 10 - system crashes with kmalloc error

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Debian 10 - system crashes with kmalloc error

Postby esters » 2020-09-22 17:32

Good Day,

Computer configuration:

HP Elite 8300 SFF:

Intel Core i7-3770T
32Gb DDR3 RAM (8*4)
1Tb WD Blue SSD - ext4
2*4Tb WD Red HDD - lvm - ext4
8Tb WD Gold HDD - lvm (mirror drive) - ext4

A few days ago I added the 8Tb drive to my current machine and configured it as a lvm mirror drive since I want to backup data from the two 4Tb drives I have as one logical volume. After that the system would crash randomly without any apparent reason. Yesterday I ran a memtest86+ complete test (4 iterations) without any errors. After that I ran :

Code: Select all
stress --cpu 8 --io 4 --vm 2 --vm-bytes 10240M


for about 8+ hours also without issue. This evening computer crashed and systemd launched recovery console, here is a snippet from dmesg:

Code: Select all
[Tue Sep 22 19:06:48 2020] Hardware name: Hewlett-Packard HP Compaq Elite 8300 SFF/3397, BIOS K01 v03.08 04/10/2019
[Tue Sep 22 19:06:48 2020] Workqueue: events_unbound async_run_entry_fn
[Tue Sep 22 19:06:48 2020] Call Trace:
[Tue Sep 22 19:06:48 2020]  dump_stack+0x66/0x90
[Tue Sep 22 19:06:48 2020]  warn_alloc.cold.120+0x6c/0xec
[Tue Sep 22 19:06:48 2020]  __alloc_pages_slowpath+0xc73/0xcb0
[Tue Sep 22 19:06:48 2020]  ? intel_atomic_commit_tail+0x7e3/0xd40 [i915]
[Tue Sep 22 19:06:48 2020]  __alloc_pages_nodemask+0x28b/0x2b0
[Tue Sep 22 19:06:48 2020]  kmalloc_order+0x14/0x30
[Tue Sep 22 19:06:48 2020]  kmalloc_order_trace+0x1d/0xa0
[Tue Sep 22 19:06:48 2020]  vc_do_resize+0xd3/0x650
[Tue Sep 22 19:06:48 2020]  ? fb_match_mode+0x28/0xa0
[Tue Sep 22 19:06:48 2020]  fbcon_init+0x42c/0x600
[Tue Sep 22 19:06:48 2020]  visual_init+0xd5/0x130
[Tue Sep 22 19:06:48 2020]  do_bind_con_driver+0x1db/0x2d0
[Tue Sep 22 19:06:48 2020]  do_take_over_console+0x113/0x190
[Tue Sep 22 19:06:48 2020]  do_fbcon_takeover+0x58/0xb0
[Tue Sep 22 19:06:48 2020]  notifier_call_chain+0x47/0x70
[Tue Sep 22 19:06:48 2020]  blocking_notifier_call_chain+0x3e/0x60
[Tue Sep 22 19:06:48 2020]  register_framebuffer+0x257/0x340
[Tue Sep 22 19:06:48 2020]  __drm_fb_helper_initial_config_and_unlock+0x216/0x440 [drm_kms_helper]
[Tue Sep 22 19:06:48 2020]  ? __switch_to+0x3da/0x440
[Tue Sep 22 19:06:48 2020]  intel_fbdev_initial_config+0x14/0x30 [i915]
[Tue Sep 22 19:06:48 2020]  async_run_entry_fn+0x39/0x160
[Tue Sep 22 19:06:48 2020]  process_one_work+0x1a7/0x3a0
[Tue Sep 22 19:06:48 2020]  worker_thread+0x30/0x390
[Tue Sep 22 19:06:48 2020]  ? create_worker+0x1a0/0x1a0
[Tue Sep 22 19:06:48 2020]  kthread+0x112/0x130
[Tue Sep 22 19:06:48 2020]  ? kthread_bind+0x30/0x30
[Tue Sep 22 19:06:48 2020]  ret_from_fork+0x35/0x40
[Tue Sep 22 19:06:48 2020] Console: switching to colour frame buffer device 256x72


Full log - https://pastebin.com/raw/aavYpBKq

If there are more steps needed to debug this issue , please let me know.

Thanks!
esters
 
Posts: 73
Joined: 2006-09-05 14:35

Re: Debian 10 - system crashes with kmalloc error

Postby stevepusser » 2020-09-22 19:08

Do you have intel-microcode from the non-free section installed?
Code: Select all
apt policy intel-microcode
MX Linux packager and developer
User avatar
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Joined: 2009-10-06 05:53

Re: Debian 10 - system crashes with kmalloc error

Postby esters » 2020-09-22 19:12

Hi,

Yes, the intel-microcode package is installed:

Code: Select all
# apt policy intel-microcode
intel-microcode:
  Installed: 3.20200616.1~deb10u1
  Candidate: 3.20200616.1~deb10u1
  Version table:
 *** 3.20200616.1~deb10u1 500
        500 http://deb.debian.org/debian buster/non-free amd64 Packages
        100 /var/lib/dpkg/status
     3.20200609.2~deb10u1 500
        500 http://security.debian.org buster/updates/non-free amd64 Packages



Code: Select all
[    1.263858] microcode: sig=0x306a9, pf=0x2, revision=0x21
[    1.264101] microcode: Microcode Update Driver: v2.2.
esters
 
Posts: 73
Joined: 2006-09-05 14:35

Re: Debian 10 - system crashes with kmalloc error

Postby LE_746F6D617A7A69 » 2020-09-23 22:20

esters wrote:After that the system would crash randomly without any apparent reason. Yesterday I ran a memtest86+ complete test (4 iterations) without any errors.
After what? Do You mean that the OS crashes when running from the backup HDD or is it crashing after making a backup (but running from the original LVM setup ? ) Is that backup HDD still connected? Did You changed the kernel in the mean time? (backports/the wonderful Liquorix kernel, etc?)
What is Your PSU wattage? - can it handle increased load?
Btw, how did You checked the RAM? - Debian' memtest does not work with UEFI systems - what is the BIOS version that You're using?

<side note: perhaps it's the time to write a truly open source memory test program? - so that shitty and proprietary efi-memtest could be replaced with some reasonable and working solution?>
Bill Gates: "(...) In my case, I went to the garbage cans at the Computer Science Center and I fished out listings of their operating system."
The_full_story and Nothing_have_changed
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Posts: 394
Joined: 2020-05-03 14:16

Re: Debian 10 - system crashes with kmalloc error

Postby esters » 2020-10-02 13:33

Hi,

After what? Do You mean that the OS crashes when running from the backup HDD or is it crashing after making a backup (but running from the original LVM setup ? ) Is that backup HDD still connected? Did You changed the kernel in the mean time? (backports/the wonderful Liquorix kernel, etc?)


The OS crashed when the system is running for a few days. There are no backup HDDs involved and no backup is being made as the 2*4Tb drives are mirrored to the 8Tb drive via LVM. I am using the default Debian Buster kernel. At the moment version 4.19.0-11

Code: Select all
# dpkg -l | grep -i linux-image-`uname -r`
ii  linux-image-4.19.0-11-amd64          4.19.146-1                          amd64        Linux 4.19 for 64-bit PCs (signed)

# uname -a
Linux elite8300sff 4.19.0-11-amd64 #1 SMP Debian 4.19.146-1 (2020-09-17) x86_64 GNU/Linux


What is Your PSU wattage? - can it handle increased load?


The PSU 240W, and as I mentioned in the first post, after an 8+ hour stress test the machine worked fine and could sustain the load

Btw, how did You checked the RAM? - Debian' memtest does not work with UEFI systems - what is the BIOS version that You're using?


RAM was tested with Memtest86 V8.4 (Correction from my post #1) (https://www.memtest86.com/), BIOS version is K01 v03.08.

What I noticed is that the crash occurs when I have a KVM instance of Kali Linux running (1 core, 2 Gb RAM). Since I made the initial post I disabled the virtual machine, but today I checked the output of dmesg and saw that there has been another crash and in this case I haven't ran any cpu or resource extensive software which could cause this.

Code: Select all
[Tue Sep 29 11:28:06 2020] rcu: INFO: rcu_sched self-detected stall on CPU
[Tue Sep 29 11:28:06 2020] rcu:         4-....: (5250 ticks this GP) idle=25e/1/0x4000000000000002 softirq=1072544/1072544 fqs=2625
[Tue Sep 29 11:28:06 2020] rcu:          (t=5251 jiffies g=9116249 q=61515)
[Tue Sep 29 11:28:06 2020] NMI backtrace for cpu 4
[Tue Sep 29 11:28:06 2020] CPU: 4 PID: 65 Comm: kswapd0 Kdump: loaded Not tainted 4.19.0-11-amd64 #1 Debian 4.19.146-1
[Tue Sep 29 11:28:06 2020] Hardware name: Hewlett-Packard HP Compaq Elite 8300 SFF/3397, BIOS K01 v03.08 04/10/2019
[Tue Sep 29 11:28:06 2020] Call Trace:
[Tue Sep 29 11:28:06 2020]  <IRQ>
[Tue Sep 29 11:28:06 2020]  dump_stack+0x66/0x90
[Tue Sep 29 11:28:06 2020]  nmi_cpu_backtrace.cold.4+0x13/0x50
[Tue Sep 29 11:28:06 2020]  ? lapic_can_unplug_cpu.cold.33+0x37/0x37
[Tue Sep 29 11:28:06 2020]  nmi_trigger_cpumask_backtrace+0xf9/0xfb
[Tue Sep 29 11:28:06 2020]  rcu_dump_cpu_stacks+0x9b/0xcb
[Tue Sep 29 11:28:06 2020]  rcu_check_callbacks.cold.81+0x1db/0x335
[Tue Sep 29 11:28:06 2020]  ? tick_sched_do_timer+0x60/0x60
[Tue Sep 29 11:28:06 2020]  update_process_times+0x28/0x60
[Tue Sep 29 11:28:06 2020]  tick_sched_handle+0x22/0x60
[Tue Sep 29 11:28:06 2020]  tick_sched_timer+0x37/0x70
[Tue Sep 29 11:28:06 2020]  __hrtimer_run_queues+0x100/0x280
[Tue Sep 29 11:28:06 2020]  hrtimer_interrupt+0x100/0x220
[Tue Sep 29 11:28:06 2020]  smp_apic_timer_interrupt+0x6a/0x140
[Tue Sep 29 11:28:06 2020]  apic_timer_interrupt+0xf/0x20
[Tue Sep 29 11:28:06 2020]  </IRQ>
[Tue Sep 29 11:28:06 2020] RIP: 0010:scan_swap_map_try_ssd_cluster+0x129/0x140
[Tue Sep 29 11:28:06 2020] Code: ff ff 41 8b 46 70 48 8b 0c 24 48 89 01 49 89 45 00 e9 08 ff ff ff 4d 85 e4 74 af ba 01 00 00 00 eb 9a
48 83 c4 08 31 c0 5b 5d <41> 5c 41 5d 41 5e 41 5f c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f
[Tue Sep 29 11:28:06 2020] RSP: 0018:ffffac21437eb980 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
[Tue Sep 29 11:28:06 2020] RAX: 0000000000000000 RBX: ffff906ab9ba8ad4 RCX: ffffac21437eba88
[Tue Sep 29 11:28:06 2020] RDX: ffffac21437eb9c8 RSI: ffffac21437eb9c0 RDI: ffff906ab9ba8a00
[Tue Sep 29 11:28:06 2020] RBP: ffff906ab2f1ae00 R08: ffff906aba504770 R09: ffffffffbc92de20
[Tue Sep 29 11:28:06 2020] R10: ffffffffbc92dde0 R11: 000000000000000e R12: ffff906ab9ba8a00
[Tue Sep 29 11:28:06 2020] R13: ffffac21437eb9c8 R14: ffff906ab9ba8a00 R15: ffffcc213fd1ef38
[Tue Sep 29 11:28:06 2020]  scan_swap_map_slots+0x6d/0x670
[Tue Sep 29 11:28:06 2020]  get_swap_pages+0x20a/0x360
[Tue Sep 29 11:28:06 2020]  get_swap_page+0x141/0x210
[Tue Sep 29 11:28:06 2020]  shmem_writepage+0x80/0x320
[Tue Sep 29 11:28:06 2020]  ? radix_tree_delete_item+0x69/0xc0
[Tue Sep 29 11:28:06 2020]  pageout.isra.49+0x117/0x340
[Tue Sep 29 11:28:06 2020]  shrink_page_list+0xa47/0xc70
[Tue Sep 29 11:28:06 2020]  shrink_inactive_list+0x207/0x590
[Tue Sep 29 11:28:06 2020]  shrink_node_memcg+0x20c/0x7b0
[Tue Sep 29 11:28:06 2020]  shrink_node+0xcf/0x450
[Tue Sep 29 11:28:06 2020]  kswapd+0x3cd/0x6e0
[Tue Sep 29 11:28:06 2020]  ? mem_cgroup_shrink_node+0x170/0x170
[Tue Sep 29 11:28:06 2020]  kthread+0x112/0x130
[Tue Sep 29 11:28:06 2020]  ? kthread_bind+0x30/0x30
[Tue Sep 29 11:28:06 2020]  ret_from_fork+0x35/0x40
[Tue Sep 29 11:38:42 2020] perf: interrupt took too long (3958 > 3947), lowering kernel.perf_event_max_sample_rate to 50500
[Tue Sep 29 12:48:59 2020] rcu: INFO: rcu_sched self-detected stall on CPU
[Tue Sep 29 12:48:59 2020] rcu:         0-....: (5249 ticks this GP) idle=0de/1/0x4000000000000002 softirq=2053707/2053707 fqs=2625
[Tue Sep 29 12:48:59 2020] rcu:          (t=5250 jiffies g=10420061 q=39909)
[Tue Sep 29 12:48:59 2020] NMI backtrace for cpu 0
[Tue Sep 29 12:48:59 2020] CPU: 0 PID: 65 Comm: kswapd0 Kdump: loaded Not tainted 4.19.0-11-amd64 #1 Debian 4.19.146-1
[Tue Sep 29 12:48:59 2020] Hardware name: Hewlett-Packard HP Compaq Elite 8300 SFF/3397, BIOS K01 v03.08 04/10/2019
[Tue Sep 29 12:48:59 2020] Call Trace:
[Tue Sep 29 12:48:59 2020]  <IRQ>
[Tue Sep 29 12:48:59 2020]  dump_stack+0x66/0x90
[Tue Sep 29 12:48:59 2020]  nmi_cpu_backtrace.cold.4+0x13/0x50
[Tue Sep 29 12:48:59 2020]  ? lapic_can_unplug_cpu.cold.33+0x37/0x37
[Tue Sep 29 12:48:59 2020]  nmi_trigger_cpumask_backtrace+0xf9/0xfb
[Tue Sep 29 12:48:59 2020]  rcu_dump_cpu_stacks+0x9b/0xcb
[Tue Sep 29 12:48:59 2020]  rcu_check_callbacks.cold.81+0x1db/0x335
[Tue Sep 29 12:48:59 2020]  ? tick_sched_do_timer+0x60/0x60
[Tue Sep 29 12:48:59 2020]  update_process_times+0x28/0x60
[Tue Sep 29 12:48:59 2020]  tick_sched_handle+0x22/0x60
[Tue Sep 29 12:48:59 2020]  tick_sched_timer+0x37/0x70
[Tue Sep 29 12:48:59 2020]  __hrtimer_run_queues+0x100/0x280
[Tue Sep 29 12:48:59 2020]  hrtimer_interrupt+0x100/0x220
[Tue Sep 29 12:48:59 2020]  smp_apic_timer_interrupt+0x6a/0x140
[Tue Sep 29 12:48:59 2020]  apic_timer_interrupt+0xf/0x20
[Tue Sep 29 12:48:59 2020]  </IRQ>
[Tue Sep 29 12:48:59 2020] RIP: 0010:scan_swap_map_slots+0x2f9/0x670
[Tue Sep 29 12:48:59 2020] Code: 01 0f 88 1d 01 00 00 48 8b 54 24 18 48 8d 42 01 48 89 44 24 18 48 3b 44 24 20 0f 83 13 02 00 00 49 8b
44 24 40 0f b6 54 10 01 <84> d2 74 18 48 8b 05 ec 8e 40 01 48 01 c0 48 3b 05 da 8e 40 01 7d
[Tue Sep 29 12:48:59 2020] RSP: 0018:ffffac21437eb9a8 EFLAGS: 00000283 ORIG_RAX: ffffffffffffff13
[Tue Sep 29 12:48:59 2020] RAX: ffffac214391d000 RBX: 00000000000000fb RCX: ffffac21437eba88
[Tue Sep 29 12:48:59 2020] RDX: 00000000000000bf RSI: 0000000000001bb4 RDI: 000000000000fff8
[Tue Sep 29 12:48:59 2020] RBP: 0000000000000000 R08: ffff906aba504770 R09: ffffffffbc92de20
[Tue Sep 29 12:48:59 2020] R10: ffffffffbc92dde0 R11: 0000000000000001 R12: ffff906ab2f1a200
[Tue Sep 29 12:48:59 2020] R13: ffff906ab2f1a2d4 R14: ffff906ab2f1a328 R15: ffffac21437eba88
[Tue Sep 29 12:48:59 2020]  ? scan_swap_map_slots+0x6d/0x670
[Tue Sep 29 12:48:59 2020]  get_swap_pages+0x20a/0x360
[Tue Sep 29 12:48:59 2020]  get_swap_page+0x141/0x210
[Tue Sep 29 12:48:59 2020]  shmem_writepage+0x80/0x320
[Tue Sep 29 12:48:59 2020]  ? count_shadow_nodes+0xa0/0xa0
[Tue Sep 29 12:48:59 2020]  pageout.isra.49+0x117/0x340
[Tue Sep 29 12:48:59 2020]  shrink_page_list+0xa47/0xc70
[Tue Sep 29 12:48:59 2020]  shrink_inactive_list+0x207/0x590
[Tue Sep 29 12:48:59 2020]  shrink_node_memcg+0x20c/0x7b0
[Tue Sep 29 12:48:59 2020]  shrink_node+0xcf/0x450
[Tue Sep 29 12:48:59 2020]  kswapd+0x3cd/0x6e0
[Tue Sep 29 12:48:59 2020]  ? mem_cgroup_shrink_node+0x170/0x170
[Tue Sep 29 12:48:59 2020]  kthread+0x112/0x130
[Tue Sep 29 12:48:59 2020]  ? kthread_bind+0x30/0x30
[Tue Sep 29 12:48:59 2020]  ret_from_fork+0x35/0x40
[Tue Sep 29 12:51:21 2020] rcu: INFO: rcu_sched self-detected stall on CPU
[Tue Sep 29 12:51:21 2020] rcu:         4-....: (5250 ticks this GP) idle=4f6/1/0x4000000000000002 softirq=1151424/1151424 fqs=2616
[Tue Sep 29 12:51:21 2020] rcu:          (t=5251 jiffies g=10444585 q=36046)
[Tue Sep 29 12:51:21 2020] NMI backtrace for cpu 4
[Tue Sep 29 12:51:21 2020] CPU: 4 PID: 65 Comm: kswapd0 Kdump: loaded Not tainted 4.19.0-11-amd64 #1 Debian 4.19.146-1
[Tue Sep 29 12:51:21 2020] Hardware name: Hewlett-Packard HP Compaq Elite 8300 SFF/3397, BIOS K01 v03.08 04/10/2019
[Tue Sep 29 12:51:21 2020] Call Trace:
[Tue Sep 29 12:51:21 2020]  <IRQ>
[Tue Sep 29 12:51:21 2020]  dump_stack+0x66/0x90
[Tue Sep 29 12:51:21 2020]  nmi_cpu_backtrace.cold.4+0x13/0x50
[Tue Sep 29 12:51:21 2020]  ? lapic_can_unplug_cpu.cold.33+0x37/0x37
[Tue Sep 29 12:51:21 2020]  nmi_trigger_cpumask_backtrace+0xf9/0xfb
[Tue Sep 29 12:51:21 2020]  rcu_dump_cpu_stacks+0x9b/0xcb
[Tue Sep 29 12:51:21 2020]  rcu_check_callbacks.cold.81+0x1db/0x335
[Tue Sep 29 12:51:21 2020]  ? tick_sched_do_timer+0x60/0x60
[Tue Sep 29 12:51:21 2020]  update_process_times+0x28/0x60
[Tue Sep 29 12:51:21 2020]  tick_sched_handle+0x22/0x60
[Tue Sep 29 12:51:21 2020]  tick_sched_timer+0x37/0x70
[Tue Sep 29 12:51:21 2020]  __hrtimer_run_queues+0x100/0x280
[Tue Sep 29 12:51:21 2020]  hrtimer_interrupt+0x100/0x220
[Tue Sep 29 12:51:21 2020]  smp_apic_timer_interrupt+0x6a/0x140
[Tue Sep 29 12:51:21 2020]  apic_timer_interrupt+0xf/0x20
[Tue Sep 29 12:51:21 2020]  </IRQ>
[Tue Sep 29 12:51:21 2020] RIP: 0010:get_swap_pages+0x18f/0x360
[Tue Sep 29 12:51:21 2020] Code: 28 01 00 00 48 89 c5 4c 39 f6 0f 84 be 00 00 00 4f 8d 24 2f 4c 89 e7 e8 5f 1c 4f 00 48 c7 c7 a0 b3 e2
bc c6 07 00 0f 1f 40 00 <49> 8d 9f d4 00 00 00 48 89 df e8 92 e9 50 00 41 8b 57 64 85 d2 74
[Tue Sep 29 12:51:21 2020] RSP: 0018:ffffac21437eba10 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
[Tue Sep 29 12:51:21 2020] RAX: 0000000000000001 RBX: 0000000000000000 RCX: dead000000000200
[Tue Sep 29 12:51:21 2020] RDX: ffff906aba504770 RSI: ffff906ab2f1af28 RDI: ffffffffbce2b3a0
[Tue Sep 29 12:51:21 2020] RBP: ffff906ab2f1ae00 R08: ffff906aba504770 R09: ffffffffbc92de20
[Tue Sep 29 12:51:21 2020] R10: ffffffffbc92dde0 R11: 0000000000000001 R12: ffff906ab2f1a310
[Tue Sep 29 12:51:21 2020] R13: 0000000000000110 R14: ffff906ab2f1a328 R15: ffff906ab2f1a200
[Tue Sep 29 12:51:21 2020]  get_swap_page+0x141/0x210
[Tue Sep 29 12:51:21 2020]  shmem_writepage+0x80/0x320
[Tue Sep 29 12:51:21 2020]  ? count_shadow_nodes+0xa0/0xa0
[Tue Sep 29 12:51:21 2020]  pageout.isra.49+0x117/0x340
[Tue Sep 29 12:51:21 2020]  shrink_page_list+0xa47/0xc70
[Tue Sep 29 12:51:21 2020]  shrink_inactive_list+0x207/0x590
[Tue Sep 29 12:51:21 2020]  shrink_node_memcg+0x20c/0x7b0
[Tue Sep 29 12:51:21 2020]  shrink_node+0xcf/0x450
[Tue Sep 29 12:51:21 2020]  kswapd+0x3cd/0x6e0
[Tue Sep 29 12:51:21 2020]  ? mem_cgroup_shrink_node+0x170/0x170
[Tue Sep 29 12:51:21 2020]  kthread+0x112/0x130
[Tue Sep 29 12:51:21 2020]  ? kthread_bind+0x30/0x30
[Tue Sep 29 12:51:21 2020]  ret_from_fork+0x35/0x40
[Tue Sep 29 12:51:42 2020] rcu: INFO: rcu_sched self-detected stall on CPU
[Tue Sep 29 12:51:42 2020] rcu:         4-....: (5250 ticks this GP) idle=4f6/1/0x4000000000000002 softirq=1151428/1151428 fqs=2624
[Tue Sep 29 12:51:42 2020] rcu:          (t=5251 jiffies g=10444593 q=85372)
[Tue Sep 29 12:51:42 2020] NMI backtrace for cpu 4
[Tue Sep 29 12:51:42 2020] CPU: 4 PID: 65 Comm: kswapd0 Kdump: loaded Not tainted 4.19.0-11-amd64 #1 Debian 4.19.146-1
[Tue Sep 29 12:51:42 2020] Hardware name: Hewlett-Packard HP Compaq Elite 8300 SFF/3397, BIOS K01 v03.08 04/10/2019
[Tue Sep 29 12:51:42 2020] Call Trace:
[Tue Sep 29 12:51:42 2020]  <IRQ>
[Tue Sep 29 12:51:42 2020]  dump_stack+0x66/0x90
[Tue Sep 29 12:51:42 2020]  nmi_cpu_backtrace.cold.4+0x13/0x50
[Tue Sep 29 12:51:42 2020]  ? lapic_can_unplug_cpu.cold.33+0x37/0x37
[Tue Sep 29 12:51:42 2020]  nmi_trigger_cpumask_backtrace+0xf9/0xfb
[Tue Sep 29 12:51:42 2020]  rcu_dump_cpu_stacks+0x9b/0xcb
[Tue Sep 29 12:51:42 2020]  rcu_check_callbacks.cold.81+0x1db/0x335
[Tue Sep 29 12:51:42 2020]  ? tick_sched_do_timer+0x60/0x60
[Tue Sep 29 12:51:42 2020]  update_process_times+0x28/0x60
[Tue Sep 29 12:51:42 2020]  tick_sched_handle+0x22/0x60
[Tue Sep 29 12:51:42 2020]  tick_sched_timer+0x37/0x70
[Tue Sep 29 12:51:42 2020]  __hrtimer_run_queues+0x100/0x280
[Tue Sep 29 12:51:42 2020]  hrtimer_interrupt+0x100/0x220
[Tue Sep 29 12:51:42 2020]  smp_apic_timer_interrupt+0x6a/0x140
[Tue Sep 29 12:51:42 2020]  apic_timer_interrupt+0xf/0x20
[Tue Sep 29 12:51:42 2020]  </IRQ>
[Tue Sep 29 12:51:42 2020] RIP: 0010:scan_swap_map_slots+0x2d6/0x670
[Tue Sep 29 12:51:42 2020] Code: 86 51 02 00 00 49 8b 54 24 40 0f b6 14 02 84 d2 74 57 48 8b 05 2b 8f 40 01 48 01 c0 48 39 c7 7f 43 83 eb 01 0f 88 1d 01 00 00 <48> 8b 54 24 18 48 8d 42 01 48 89 44 24 18 48 3b 44 24 20 0f 83 13
[Tue Sep 29 12:51:42 2020] RSP: 0018:ffffac21437eb9a8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
[Tue Sep 29 12:51:42 2020] RAX: 0000000000000002 RBX: 00000000000000f8 RCX: ffffac21437eba88
[Tue Sep 29 12:51:42 2020] RDX: 00000000000000bf RSI: 0000000000001bb4 RDI: 000000000000fff8
[Tue Sep 29 12:51:42 2020] RBP: 0000000000000000 R08: ffff906aba504770 R09: ffffffffbc92de20
[Tue Sep 29 12:51:42 2020] R10: ffffffffbc92dde0 R11: 000000000000003b R12: ffff906ab2f1a200
[Tue Sep 29 12:51:42 2020] R13: ffff906ab2f1a2d4 R14: ffff906ab2f1a328 R15: ffffac21437eba88
[Tue Sep 29 12:51:43 2020]  ? scan_swap_map_slots+0x6d/0x670
[Tue Sep 29 12:51:43 2020]  get_swap_pages+0x20a/0x360
[Tue Sep 29 12:51:43 2020]  get_swap_page+0x141/0x210
[Tue Sep 29 12:51:43 2020]  shmem_writepage+0x80/0x320
[Tue Sep 29 12:51:43 2020]  ? radix_tree_delete_item+0x69/0xc0
[Tue Sep 29 12:51:43 2020]  pageout.isra.49+0x117/0x340
[Tue Sep 29 12:51:43 2020]  shrink_page_list+0xa47/0xc70
[Tue Sep 29 12:51:43 2020]  shrink_inactive_list+0x207/0x590
[Tue Sep 29 12:51:43 2020]  shrink_node_memcg+0x20c/0x7b0
[Tue Sep 29 12:51:43 2020]  shrink_node+0xcf/0x450
[Tue Sep 29 12:51:43 2020]  kswapd+0x3cd/0x6e0
[Tue Sep 29 12:51:43 2020]  ? mem_cgroup_shrink_node+0x170/0x170
[Tue Sep 29 12:51:43 2020]  kthread+0x112/0x130
[Tue Sep 29 12:51:43 2020]  ? kthread_bind+0x30/0x30
[Tue Sep 29 12:51:43 2020]  ret_from_fork+0x35/0x40
[Tue Sep 29 15:58:51 2020] perf: interrupt took too long (4956 > 4947), lowering kernel.perf_event_max_sample_rate to 40250
esters
 
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